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Patented Mar. 9, 1897.

INVENTOR 1n: Nunms PETERS ce. PHoYmLn-no.. wAsmnoron. n. z.

UNiTED STATES PATinwr OFFICE.

DAVID IV. BLACK, OF BUTLER, PENNSYLVANIA, ASSIGNOR TO BENJAMIN MASSETH,OF SAME PLACE.

PACKER.

SPECIFICATION forming part of Letters Patent No. 578,388, dated March 9,1897.

Application led May 2, 1896. Serial No. 589,977. (No model.)

Be it known that I, DAVID W. BLACK, of Butler, in the county of Butlerand State of Pennsylvania, have invented a'new and useful Improvement inPackers, of which the following is a full, clear, and exact description,reference being had to the accompanyingdrawings, forming part of thisspecification, in which- Figure l is a side elevation of a packerprovided with my improved lock and inserted in the well, but as yetunpacked. Fig. 2 is a vertical section of the same. Figs. 3 and 4 aresimilar views to Figs. l and 2, respectively, but showing the lockbroken and the packer expanded. Fig. 5 is a cross-section on the line VV of Fig. l. Fig. 6 is va perspective View of one form of my improvedlock. Fig. 7 is a side elevation of the s'ame as fractured to unlock thepacker, and Fig. 8 is a perspective view of another form of my lock. Myinvention relates to that class of expansible packers for deep wellswherein a lock is employed to hold the spring which acts upon the slipsor arms and is designed to provide an improved construction of thelock,whereby its action is made positive and certain.

It consists in al lock of this character which is arranged to benddownwardly in its intermediate port-ion when struck by the weight, thusinsuring the withdrawing of its ends from the holes in the casing.

In the drawings, in which similar characters indicate correspondingparts, 2 represents a portion of the well-casing, and 3 the eXpansiblepacking-tube, made, preferably, of rubber, which ts around the casingand bears at one end against a shoulder a, formed, preferably, by acoupling-sleeve4 on the casing. At its otherend the packer bears againsta shoulder b, formed, preferably, by the end of a tubular, conical, orwedge-shaped section 5, which surrounds and slides loosely upon thecasing.

6 is a collar or band which encircles the casing below the section 5 andis provided with upwardly-projectin gsprin g arms or slips 7, arrangedto wedge between the tapered s urface of the cone 5 and the sides of thewell. 5o

A spiral spring S encircles the casing below the band 6 and bearing upona lower sleeve 9, secured to the casing, acts to force the collar orband 6 upwardly. The spring is normally held compressed by a lock orcross bar l0, which projects through holes in the sides of the casingand engages the collar 6, thus preventing its upward movement, this lockbeing broken after the packer is lowered to the desired point by aweight dropped into 6o the top of the casing. This locking-barconstitutes the feature of my invention, which consists in forming itwith an intermediate bending portion instead of cast-iron or someeasily-broken metal, as formerly. Thus in the form of Figs. 2, 5, and 6I cast a disk 11, having projecting arms 12, this disk being weakened bya slot 13. Crossing this slot and cast into the disk is a flexible wire14, which, when the weight strikes the lock, will 7o bend downwardly,causing the arms l2 to be drawn out of the holes in the casing, the lockassuming the shape of Fig. 7..

In Fig. 8 I show another form of my lock, which is made of wrought-iron,the central '75 portion 1l', having arms 12' and being slotted inwardlyat 13', leaving a connecting-neck 14', which will bend in the samemanner as the wire of the iirst form.

The advantages of my invention will be 8o appreciated by those skilledin the art, since the unlocking of the packer is made positive anduniformly certain, the armsrbeing positively drawn from the holes inevery case..

Many changes may be made in the material employed'and the form of thelock Without departing from my invention, since I consider myself thefirst to employ a lock of this character having an intermediate bendingor flexible portion.

I claim- 1. A lock for oil-well packers, consisting of a body portionhaving arms arranged to project through slots in the packer, said bodyened portion and Connect-ing the parts on 1o each side thereof;substantially as described.

In testimony whereof I have hereunto set my hand.

DAVID W. BLACK.

Witnesses:

ALEX. MITCHELL, ANDREW G. WILLIAMS.

